<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>筛选数组</title>
</head>
<body>
    <script>
       const arr=[10,20,30]
       const newArr= arr.filter((item,index)=>{
          console.log(item)
          console.log(index)
          return item>=20
       })
       console.log(newArr)
    </script>
</body>
</html>